re: Update in OP; Treating young lab for heart worms

We adopted a chihuahua with heart worms. It was tough keeping her calm after treatment but we managed. Actual treatment didn't really effect her at all as far as how she would act. There were several times where she got excited when we would come home and take her outside and she was fine. I guess there is some luck involved.

I've heard it's tougher on larger dogs but don't know if that's true or not.